Alloy Information Report for Inconel™ 738

General Characteristics of Inconel™ 738

Inconel™ 738 offers a combination of outstanding high-heat creep-rupture strength and corrosion resistance better than many high-strength superalloys with lower chromium content. This nickel-based alloy is vacuum-cast and precipitation-hardened, offering exceptional mechanical properties to 1800°F (982°C). IN-738 holds up to the hot corrosive environments found in the turbine industry.

Chemical Composition of Inconel™738

Carbon 0.15-0.20
Cobalt 8.00-9.00
Chromium 15.70-16.30
Molybdenum 1.50-2.00
Tungsten 2.40-2.80
Tantalum 1.50-2.00
Columbium 0.60-1.10
Aluminum 3.20-3.70
Titanium 3.20-3.70
Aluminum and titanium 6.50-7.20
Boron 0.005-0.015
Zirconium 0.05-0.15
Iron 0.50 max
Manganese 0.20 max
Silicon 0.30 max
Sulfur 0.015 max
Nickel remainder

Heat Treatment of Inconel™738

2050°F (1121°C) for 2 hours
Air cool
1550°F (843°C) for 24 hours
Air cool

Applications of Inconel™ 738

Gas turbine blades and vanes for industrial use

Machinability of Inconel™ 738

Sturdy and short drills, reamers, taps and end mills
Positive feeds with no tool dwelling
High-speed tools in turning operations
Carbide tools for tapping, reaming and drilling
Lubricate continuously
- Chemical emulsions for turning
- Chlorinated oil for tapping, reaming, drilling and milling
6000 rpm wheel speed for surface grinding, using highly sulfurized oil
Normal finish grinding techniques

Corrosion Resistance of Inconel™ 738

Exceeds strong superalloys
Resists oxidation to 2000°F (1093°C)
Improved sulfidation resistance up to 1800°F (982°C)
Demonstrated resistance atmospheres with hydrogen sulfide and sulfur dioxide to 1800°F (982°C)

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